This is not simple, but it is wonderful. I’ve added a small guiding scope(QHY mini) and camera(QHY5L-II-M) to the mount. Sharpcap uses the guide camera for polar alignment; Stellarium will point the mount to my target; AstroTortilla checks that the camera is pointed correctly and adjusts the aim; and PHD2 continuously monitors the image from the guide camera and makes minute corrections to keep the aim perfect.
There are probably limits to how long the guiding setup can hold position but it’s certainly good for 90 seconds even with indifferent polar alignment.
Astrophotography Newbie 